Completely uninstall VS Code extensions

All the answers above are correct, but for a beginner, I wanted to add that all you have to do is, run this command in your terminal to remove ALL extensions/themes.

For Mac/Linux

rm -rf ~/.vscode/extensions

For Windows

rmdir %USERPROFILE%\.vscode\extensions /s

Turns out the extensions are stored under %USER%\.vscode\extensions. Deleting that gets rid of them.

For Windows : %USER%\\.vscode\extensions (or) %USERPROFILE%\.vscode\extensions

Location of extensions for Linux/MAC: ~/.vscode/extensions

It worked for me, but the enviroment variable was %USERPROFILE%\.vscode\extensions

You can remove them at:

Windows: %USERPROFILE%\.vscode\extensions

Mac: ~/.vscode/extensions

Linux: ~/.vscode/extensions